Some people watch Disney cartoons for christmas, these lectures are pretty much standard viewing here in the household at this time.

It's a mind blowing awesome series of lectures, and don't worry about the screaming baby

Waking Up in the Universe - Growing Up in the Universe
http://www.youtube.com/watch?v=jHoxZF3ZgTo

Designed and Designoid Objects - Growing Up in the Universe
http://www.youtube.com/watch?v=xGyh1Qsw-Ak

Climbing Mount Improbable - Growing Up in the Universe
http://www.youtube.com/watch?v=YT1vXXMsYak

The Ultraviolet Garden - Growing Up in the Universe
http://www.youtube.com/watch?v=_igTWNidwnk

The Genesis of Purpose - Growing Up in the Universe
http://www.youtube.com/watch?v=qm-0Z0ceezQ

This is just an amazing lecture about the physics of nuclear bombs and reactors.

There's lots of other videos in this series that are all fantastic to watch and learn from.

http://www.youtube.com/watch?v=5BHdsjo-NR4

The world needs more teachers like this guy.

Oh, and that is the fucking coolest chalkboard EVER.